Printing-block for block-printing machines



W. H. WJALRON.` PRHHING BLOCK FOR BLOCK PRSWDNG MACHHIES.

' APPLICATION man 59.119241 f 1,365-, s Patented. Jan. 11, 1,921.

UNITED STATES PATENT OFFICE.

PRINTING-BLOCK FOR BLQCK-PRINTING MACHINES.

Specification of Letters Patent.

Patented. Jan. 11, 1921.

Application filed December 3, 1920. Serial No. 427,994.

To @ZZ whom t may concern Be it known that I, WILLIAM H. WAL- nnoN, a citizen of the United States, residing in New Brunswick, NewV Jersey, have invented certain Improvements in Printing- Blocks for Block-Printing Machines, of which the following is a specication.

The obj ect of my invention is to provide a printing block for block printing machines which will not warp and which can be made ready in the machine very quickly.

This object I attain in the following manner:

Figure l is a perspective view of a printing block for a block printing machine7 made in accordance with my invention;

Fig. 2 is a sectional view of a portion of the block.

l is a metal plate, preferably of steel and made true and 2 is a block of pressed wood pulp which is secured to the metal plate by screws 3 or other fastenings so as to firmly secure the wood pulp block to the plate. The steel plate is made heavy and as the block 2 is made of wood pulp is not liable to warp so that the block remains true under all conditions. The wood pulp block 2 can he cut in engraving the design in the same manner as a wooden block and after the block has been located in the iat block printing machine, very little trouble is found in making ready so that it will make the proper impression.

I claim:

A printing block for block printing machines having a metallic back and a pressed wood pulp face firmly secured to the back.

WILLIAM H. WALDRON. 

